Price of circuit breakers for secondary distribution boxes

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Circuit breakers for secondary distribution boxes typically range from $6 to $100 per unit depending on type, amperage, and protection features.

Typical Part Costs

Standard Miniature Circuit Breakers (MCBs): Single-pole thermal-magnetic breakers for residential or light commercial circuits cost $6–$12 for 15A, $7–$14 for 20A, and $10–$18 for 30A depending on brand and features. Bulk purchases can reduce the per-unit cost to $4–$8 .
AFCI (Arc-Fault Circuit Interrupter) Breakers: Provide arc-fault protection and cost $30–$80 per unit for 15A–30A ratings .
Combination AFCI/GFCI Breakers: Offer both arc-fault and ground-fault protection, priced at $50–$100 or more per unit .
MCCBs (Molded Case Circuit Breakers): Typically used in higher-current applications; prices vary widely based on amperage and interrupt rating, often $50–$300+ per unit depending on specifications .

Installation and Labor Costs

Installing or replacing a single breaker usually requires $75–$200 in labor, with more complex installations (hidden wiring, panel upgrades, or AFCI/GFCI integration) potentially taking 4–6 hours .
For larger panels or main breakers, total installed costs can range from $150–$800, with high-amperage mains or code upgrades exceeding $1,000 including permits .
Regional variations affect labor costs: urban areas tend to be 15–25% higher than rural areas due to labor rates and permitting requirements .

Factors Affecting Price

Breaker Type: Standard vs AFCI/GFCI vs combination units.
Amperage Rating: Higher amperage units cost more due to thicker bimetal elements and higher interrupt testing.
Brand and Certification: Premium brands like Square D, Eaton, Schneider Electric, and Siemens may carry higher prices.
Panel Compatibility: Matching breakers to the existing distribution board is essential to avoid compatibility issues.
Quantity: Bulk purchases reduce per-unit cost significantly.

Summary

For secondary distribution boxes (final distribution boards), expect basic MCBs to cost $6–$18 per unit, while advanced protection breakers like AFCI/GFCI can reach $50–$100. Labor and installation can add $75–$200 per breaker, with total project costs influenced by panel type, amperage, and local regulations . Choosing the right breaker type and quantity, and ensuring compatibility with the distribution board, helps optimize both safety and cost.

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